SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIOUE ETC. 120- 
The implementation analysis is a study of the kinds of 
national or international institutions most helpful in bringing 
about that particular constellation of the national or world 
economy which has emerged as the optimal one in the selection 
analysis, or at least to bring about a close approximation to 
‘hat constellation. 
The selection analysis must precede the implementation 
analysis. If we go about it the other way, we would be putting 
the cart before the horse. The selection analysis must be built 
on a quantitative decision model, as distinct from an explana- 
tory model or a forecasting model. This will, I believe, be a 
distinctive feature of the econometric planning work of the 
future, since our main concern will be research work on how 
‘he economy can best be steered. 
In the technical part — which I shall not discuss in detail 
here — a serious warning regarding a very popular « planning 
procedure » is in order. It is a procedure that owes its popu- 
larity more to its simplicity than to its real relevance for true 
olannine. 
I am referring to the popular procedure of initially guessing 
at a « reasonable » national growth rate that « could probably 
be obtained », and from this assumption drawing conclusions 
regarding the production needed in special sectors of the eco- 
nomy, the size of needed investments, etc. The reason why 
this method has become so widely used is to be found, I think, 
in its simplicity rather than in the fact that it is realistic and 
rational. 
The special aspects of the economy, such as production in 
the various sectors, the size of investments, etc. are, in fact, 
not determined even if the national rate of economic growth is 
given. There may be many different development patterns that 
all give the same rate of growth of GNP (The Gross National 
Product) or of some other statistical measure of which one 
mav think. 
[17] Frisch - pag. 
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